Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 117)

ASCII I/O Module Tutorial
Chapter 4
4Ć43
Procedure P1 Connect the 1770ĆCB cable, and set your industrial
terminal to alphanumeric mode (check parameters)
• Initialize the module by changing PLCĆ3 operation mode
3[ENTER]2[ENTER]
Procedure P2 Enter your data
Procedure P3 Connect the 1775ĆCAT cable, and set your industrial
terminal to PLCĆ3 mode
Procedure P4 Observe how the data string is stored in data table file O6:0
Results The module removed header and trailing characters, and
transferred 15 data characters, the set string length (Figure 3.8)
Figure 3.8
Removed Header and Trailing Characters
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
3 header characters removed 4 trailing characters removed
15 character string
0
11837
RADIX = %A START = WO006:0000
WORD #
00000
0
00H00H
1
00H00H
2
3
3
4 5
4
6 7
5
8 9
6
0 1
7
2 3
00010 4 5 6 7 00H00H 00H00H 00H00H 00H00H 00H00H 00H00H
RADIX = %H START = WO006:0000
WORD #
00000
0
0000
1
0000
2
2033
3
3435
4
3637
5
3839
6
3031
7
3233
00010 3435 3637 0000 0000 0000 0000 0000 0000
Notice the following:
Although you entered 22 characters, the module removed the first three
characters and the four trailing characters.
The module transferred 15 characters, the set string length.
In report generation mode you can mix BCD digits with ASCII characters.
The module sets the ASCII data conversion to two ASCII characters per
word. You select the type of data conversion for BCD digits (either three
BCD or four BCD digits per word) in initialization word two (IW2). If
Selecting Report Generation
Mode, Data Conversion, and
BCD Delimiter